docs: def signalize_extensions():
      """DB API 2.0 extension are reported by warnings at run-time."""
      warnings.warn("DB-API extension cursor.rownumber used", SalesforceWarning)
      warnings.warn("DB-API extension connection.<exception> used", SalesforceWarning)  # TODO
      warnings.warn("DB-API extension cursor.connection used", SalesforceWarning)
      # not implemented DB-API extension cursor.scroll(, SalesforceWarning)
      warnings.warn("DB-API extension cursor.messages used", SalesforceWarning)
      warnings.warn("DB-API extension connection.messages used", SalesforceWarning)
      warnings.warn("DB-API extension cursor.next(, SalesforceWarning) used")
      warnings.warn("DB-API extension cursor.__iter__(, SalesforceWarning) used")
      warnings.warn("DB-API extension cursor.lastrowid used", SalesforceWarning)
      warnings.warn("DB-API extension .errorhandler used", SalesforceWarning)